Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1998e7aacfea590…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 08:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5a47b66e4a87ce5a3b5b23f327314d9 SHA-1: 352ea844f65538cd5675835156ea4195c4e5ef7a SHA-256: c1998e7aacfea590a9116264ce19c506fcde75b1c9afd57bdc4943ddb962aad5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external links and a deceptive download button, suggesting a lure to download further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=ishiiruka+apk+download PDF link annotation
    • https://eslms.com/userfiles/file/budedakeromasozixez.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/11907163597.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mites.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/jekowaxus.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/tabenoni.pdfIn PDF document text
    • http://guitarenko.fr/img/files/gekoromutudifabaku.pdfIn PDF document text
    • http://fullx.net/files/52883893504.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109101100009497.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/5470949475.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/48c5eae58022b073e0ceb2bd6e84a808/68613517279.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/176292975.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1fedv98u1qjbun983rklo76va2/91611400628.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f0c056a6f5.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/p5uno6o6n3129j58diqilon1gd/33804816941.pdfIn PDF document text
    • https://10fci.org/userfiles/file/47794918280.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/83430491763.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/76904751363.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/880984046.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210914043256735188fbu33.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/videfixuwovixegi.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/34357897457.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/zuxoposa.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/64867450460.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 18860 bytes
SHA-256: 5ea6a98e00d5d1d3018f3d08eb23cb0319d0aaf6f2264dc557912e06c97f9851
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 10488 bytes
SHA-256: ac49382ff4481be84306c9439fc4f355c04a9129edd938d88d2718c62d24767d

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